View source for One-hit knockout move

'''One-hit knockout moves''' (Japanese: '''{{ruby|一撃必殺技|いちげきひっさつわざ}}''' ''one-hit knockout move''), commonly abbreviated as '''one-hit KO moves''' or '''OHKO moves''', are [[move]]s that deal fixed damage to bring the target's [[HP]] to 0 and thus [[fainting]], but have a particularly low chance to successfully hit the target.

==In the games==
===List of one-hit knockout moves===
{| class="roundy" style="margin:auto; background: #ddf; {{roundy}}; border: 5px solid #ccf"
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{| border=1 width="100%" class="sortable" style="margin:auto; background: #FFF; border:1px solid #ddf; border-collapse:collapse"
|- style="background: #ddf"
! {{color2|000|Move}}
! {{color2|000|Type}}
! {{color2|000|Damage category|Cat.}}
{{movelist|Fissure|Ground|cat=Physical}}
{{movelist|Guillotine|Normal|cat=Physical}}
{{movelist|Horn Drill|Normal|cat=Physical}}
{{movelist|Sheer Cold|Ice|cat=Special}}
|}
|}

===Effects involving one-hit knockout moves===
====Abilities====
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|-
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{| border=1 width="100%" style="margin:auto; background: #FFF; border:1px solid #ddf; border-collapse:collapse;"
|- style="background: #ddf;"
! Name
! Effect
|-
| {{a|Anticipation}}
| When the Pokémon enters a battle, it senses whether the opponents know any one-hit KO moves or moves that are super effective against it.
|-
| {{a|Sturdy}}
| The Pokémon cannot be knocked out by a single hit as long as its HP is full. One-hit KO moves will also fail to knock it out.
|}
|}

===In the core series===
{{MoveResearch|1. Can Endure, Focus Band, and Affection allow a Pokémon to survive a one-hit knockout move (in each generation)?<br/>2. Interaction with substitute<br/>3. Does the accuracy formula change against the Dynamax barrier?<br/>4. If the target Pokémon is immune to the attack type (such as {{m|Fissure}} on a {{type|flying}} Pokémon or on a Pokémon with {{a|Levitate}}), can it succeed?}}
One-hit KO moves deal fixed [[damage]] to bring the target to 0 HP (65535 in [[Generation I]], equal to the target's current HP from [[Generation II]] onward). Despite being damaging moves, they do not consume a [[Gem]]. If the target faints, the game displays the message "It's a one-hit KO!" (or simply "One-hit KO!" in Generation I).

In [[Generation]]s {{gen|I}} and {{gen|II}}, super effective one-hit knockout moves display the super effective message and play the appropriate sound effect. From Generation III onward, type-effectiveness messages no longer appear, but appropriate type-effectiveness sound effects still play.

In [[Generation III]] only, due to an oversight, a one-hit knockout move can fail to break a {{OBP|substitute|doll}}. If a Pokémon's substitute has more HP left than the Pokémon does, the substitute will not break when hit by a one-hit knockout move. This occurs because one-hit knockout moves deal damage equal to the Pokémon's current HP. This oversight was fixed in [[Generation IV]].

Since one-hit KO moves deal damage, a [[Focus Sash]] or the Ability {{a|Disguise}} can allow a Pokémon to survive such moves.

All OHKO moves have a base [[PP]] of 5. If an OHKO move becomes a [[Z-Move]], it will have a base power of 180. If it becomes a [[Max Move]], it will have a base power of 130.

One-hit KO moves will always fail against [[Dynamax]] Pokémon and [[Tera Raid]] bosses are unaffected by them. However, in [[Max Raid Battle]]s, one-hit KO moves can deplete two bars of strength from a mysterious barrier.

OHKO moves are not present in {{g|Legends: Arceus}}. Fissure and Sheer Cold are present in {{g|Legends: Z-A}}; however, instead of instantly knocking out the targets, they behave like regular damaging moves with massive base power, but taking longer to start-up and execute than any other player-usable move in the game, even as a [[Plus Move]].

====Accuracy mechanics====
=====Generation I=====
All OHKO moves have an [[accuracy]] of 76/256 (approximately 30%), but they will automatically fail if the user's {{stat|Speed}} stat is lower than the target's. An [[X Accuracy]] will guarantee that all OHKO moves hit. The accuracy of OHKO moves in Generation I is affected by the standard {{stat|accuracy}} and {{stat|evasion}} stats.

=====Generation II=====
OHKO moves automatically fail if the target has a higher [[level]] than the user. Their accuracy starts at 76/256 (approximately 30%) and increases by 2/256 (approximately 0.8%) for each level the user is above the target. This means that if the user's level is at least 90 levels greater than the target's, the move will have 100% accuracy. An X Accuracy will guarantee that all OHKO moves hit. The accuracy of OHKO moves in Generation II is affected by the standard accuracy and evasion stats.<ref>[https://web.archive.org/web/20140909105049/http://www.upokecenter.com/dex/?lang=en&move=32 Ultimate Pokémon Center]</ref>

====Generation III onward====
OHKO moves automatically fail if the target has a higher level than the user. Their accuracy starts at 30% and increases by 1% for each level the user is above the target. {{stat|Accuracy}} and {{stat|evasion}} stats no longer influence the move's accuracy, including modifiers that do not use stages, such as {{m|Gravity}}, [[Wide Lens]], and {{a|Compound Eyes}}. Effects that allow moves to always hit (such as {{a|No Guard}}, {{m|Mind Reader}} and {{m|Lock-On}}, but not {{m|Telekinesis}}) still work on OHKO moves.

Since [[Generation VII]], the accuracy of {{m|Sheer Cold}} starts at 20% instead if the user is not {{type|Ice}}. In addition, all OHKO moves now display their accuracy as 30% instead of —, although the calculation remains unchanged (except for Sheer Cold used by a non-Ice-type Pokémon).

===In spin-off games===
====Pokémon Mystery Dungeon series====
In the [[Pokémon Mystery Dungeon series]] of games, OHKO moves can hit regardless of level, although they are very prone to missing as always. When one hits, the game states that the target fainted through "calamitous damage" (changed to the standard "It's a one-hit KO!" in {{FB|Pokémon Mystery Dungeon: |Gates to Infinity}}). However, they actually do 9999 damage, which can be seen when the attacks are reflected by {{DL|IQ|IQ skills}} such as Counter Hitter if the Pokémon is revived by a {{DL|Seed|Reviver Seed}}.

==In animation==
===''Pokémon the Series''===
====Gallery====
<gallery>
AJ Sandshrew Fissure.png|{{m|Fissure}} being used by [[A.J.]]'s {{p|Sandshrew}}
Alain Bisharp Guillotine.png|{{m|Guillotine}} being used by [[Alain]]'s Bisharp
Clay Excadrill Horn Drill.png|{{m|Horn Drill}} being used by [[Clay's Excadrill]]
Solidad Lapras Sheer Cold.png|{{m|Sheer Cold}} being used by [[Solidad]]'s {{p|Lapras}}
</gallery>

===''Pokémon Horizons: The Series''===
====Gallery====
<gallery>
Coral Glalie Sheer Cold.png|{{m|Sheer Cold}} being used by [[Coral]]'s {{p|Glalie}}
</gallery>

==In the manga==
===Pokémon Adventures===
====Gallery====
<gallery>
Giovanni Rhydon Fissure Adventures.png|{{m|Fissure}} being used by {{adv|Giovanni}}'s {{p|Rhydon}}
Misty Krabby Guillotine Adventures.png|{{m|Guillotine}} being used by [[Misty]]'s {{p|Krabby}}
Blue Rhydon Horn Drill.png|{{m|Horn Drill}} being used by [[Blue's Rhydon]]
Glalie Sheer Cold Adventures.png|{{m|Sheer Cold}} being used by the {{gdis|Battle Factory|III}}'s {{p|Glalie}}
</gallery>

==Trivia==
* {{p|Lapras}} can learn the most one-hit KO moves of any Pokémon (excluding Smeargle), being able to learn {{m|Sheer Cold}}, {{m|Fissure}}, and {{m|Horn Drill}}.
* Starting in Generation VII, all one-hit KO moves are normally ineffective against one type. {{m|Fissure}} cannot affect {{type|Flying}} Pokémon, {{m|Guillotine}} and {{m|Horn Drill}} cannot affect {{type|Ghost}} Pokémon, and (starting in [[Generation VII]]) {{m|Sheer Cold}} cannot affect {{type|Ice}} Pokémon.
** Immunity to Sheer Cold is the only one not based on a type immunity, and thus cannot be bypassed with a [[Ring Target]] or a move that removes type immunities. Sheer Cold is also the only one-hit KO move where this immunity did not exist until after its debut generation.
* Starting in Generation VII, Sheer Cold is the only one-hit KO move with different accuracy mechanics from other one-hit KO moves.
* Sheer Cold is the only one-hit knockout move to be introduced after [[Generation I]].

==In other languages==
{{langtable|color=ddf|bordercolor=ccf
|zh_yue=一擊必殺的招式 ''Yātgīkbītsaat dīk Jīusīk''
|zh_cmn=一擊必殺的招式 / 一击必杀的招式 ''Yījíbìshā de Zhāoshì / Yījībìshā de Zhāoshì''
|fr=Capacité pouvant mettre K.O. en un coup
|de=K.O.-Attacke
|it=Mossa che causano KO immediato
|ko=일격필살 기술 ''Ilgyeokpilsal Gisul''
|es=Movimiento fulminante
}}

==References==
{{reflist}}<br>

==Related articles==
{{OHKO}}<br>
{{Moves by usage method}}

{{Project Moves and Abilities notice}}

[[Category:Moves|*]]
[[Category:One-hit knockout moves|*]]
[[Category:Game mechanics]]

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[[ja:一撃必殺技]]
[[zh:一击必杀的招式]]